This bitmap-style field records which of this interface's transmit statistics had exceeded their configured thresholds at the moment this historical sample was captured. This preserved threshold-breach record lets an admin later confirm exactly which metric (broadcast rate, byte rate, etc.) was flagged as abnormal at that specific past moment, without needing to have been watching live at the time. An archived thresholded value flagging only the total-bytes counter for this sample would confirm that particular historical alert was about link saturation, not a broadcast issue.